package basics;

import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.*;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.List;
import java.util.Map;

public class ThirdHttpsAccess {
    public static void main(String[] args) {

    }
    /**
     * 访问第三方路径post方式
     * @param postUrl 请求路径
     * @param obj 传参
     * @param connect 请求头部分参数
     * @return
     */
    public static String doTFPost(String postUrl, JSONObject obj, Map<String,String> connect) {
        String lines = "";
        StringBuffer sb = new StringBuffer("");
        try {
            //忽略https证书
            HttpsURLConnection.setDefaultHostnameVerifier(new NullHostNameVerifier());
            SSLContext sc = SSLContext.getInstance("TLS");
            sc.init(null, NullHostNameVerifier.trustAllCerts, new SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
            // 创建连接
            URL url = new URL(postUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestMethod("POST");
            connection.setUseCaches(false);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
            connection.setRequestProperty("Accept", "application/json");
            connection.setRequestProperty("Accept-Encoding", "");
            for (Map.Entry<String,String> entry : connect.entrySet()) {
                String key = entry.getKey();
                String value = entry.getValue();
                if (value != null) {
                    connection.setRequestProperty(key, value);
                }
            }
            connection.connect();
            // POST请求
            DataOutputStream out = new DataOutputStream(connection.getOutputStream());
            out.write(obj.toString().getBytes());
            out.flush();
            out.close();
            // 读取响应
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
            while ((lines = reader.readLine()) != null) {
                lines = new String(lines.getBytes());
                sb.append(lines);
            }
            reader.close();
            // 断开连接
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }return sb.toString();
    }

    /**
     * 向指定URL发送GET方法的请求
     * @param url 发送请求的URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式*/
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            /*
             * for (String key : map.keySet()) { System.out.println(key + "--->"
             * + map.get(key)); }
             */
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            logger.error("发生GET请求出错");
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

}

/**
 * @Description 忽略证书
 */
 class NullHostNameVerifier implements HostnameVerifier {

    private static final Logger log = LoggerFactory.getLogger(NullHostNameVerifier.class);

    @Override
    public boolean verify(String hostname, SSLSession session) {
        log.info("RestUtilImpl", "Approving certificate for " + hostname);
        return true;
    }

    public static TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager(){
        public X509Certificate[] getAcceptedIssuers(){return null;}
        public void checkClientTrusted(X509Certificate[] certs, String authType){}
        public void checkServerTrusted(X509Certificate[] certs, String authType){}
    }};

}
